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Understanding narrow SOL power flux features in COMPASS limiter plasmas by use of Langmuir probes(posterPSI2014,Kanazawa)

SYSNO ASEP	0437452
Document Type	O - Others
R&D Document Type	Others
Title	Understanding narrow SOL power flux features in COMPASS limiter plasmas by use of Langmuir probes(posterPSI2014,Kanazawa)
Author(s)	Dejarnac, Renaud (UFP-V)_{RID, ORCID} Stangeby, P.C. (CA) Goldston, R.J. (US) Horáček, Jan (UFP-V)_{RID, ORCID} Hron, Martin (UFP-V)_{RID, ORCID} Kocan, M. (FR) Komm, Michael (UFP-V)_{RID, ORCID} Pánek, Radomír (UFP-V)_RID Pitts, R.A. (FR) Vondráček, Petr (UFP-V)_{RID, ORCID}
Year of issue	2014
Language	eng - English
Country	JP - Japan
Keywords	Heat loads ; limiter ; narrow channel ; probes
Subject RIV	BL - Plasma and Gas Discharge Physics
R&D Projects	GAP205/11/2341 GA ČR - Czech Science Foundation (CSF)
	GAP205/12/2327 GA ČR - Czech Science Foundation (CSF)
	LM2011021 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Institutional support	UFP-V - RVO:61389021
Annotation	Předneseno na:PSI2014,Kanazawa, 26-30.05.2014 The narrow scrape-off layer power component observed in COMPASS inner wall limiter circular discharges by means of IR thermography is investigated by Langmuir probes embedded in the limiter. The power flux profiles are in good agreement with IR observations and can be described by a double-exponential decay with a short decay length (< 5 mm) just outside the separatrix and a longer one (~ 50 mm) for the rest of the profile in the main scrape-off layer. Non-ambipolar currents measured at the limiter apex play a relatively modest role in the formation of the narrow component. The fraction of the deposited power due to non-ambipolarity varies between 2% and 45%. On the other hand, narrow power widths are roughly consistent with ones indicated by neo-classical considerations which suggests that the latter effects may be dominant
Workplace	Institute of Plasma Physics
Contact	Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
Year of Publishing	2015

Number of the records: 1